I changed the entry in php.ini from 2M to 100M. Now PHPmyAdmin shows me a max filesize of 8.192KB, which is of course far better than 2.048KB but still not satisfying. I'll get data files which will be several MB large, even zipped more than 8MB. Because today mySQL is discussed as a real alternative to commercial databases it should easily handle that amount of data, shouldn't it?